00016-medium-replace

[yunliuyan]

Replace

by Anthony Fu @antfu

   

实现 Replace<S, From, To> 将字符串 S 中的第一个子字符串 From 替换为 To 。

例如

type replaced = Replace<'types are fun!', 'fun', 'awesome'> // 期望是 'types are awesome!'

[yunliuyan]

思路

infer 大法好

代码实现

type Replace<S extends string, From extends string, To extends string> = S extends `${infer L}${From}${infer R}` ? `${L}${To}${R}` : never;

type replaced = Replace<'types are fun!', 'fun', 'awesome'> // 期望是 'types are awesome!'

[liangchengv]

type Replace<S extends string, From extends string, To extends string> = S extends `${infer U}${From}${infer R}` ? `${U}${To}${R}` : S;

type replaced = Replace<'types are fun!', 'fun', 'awesome'>; 

[Janice-Fan]

type Replace<T extends string, U extends string, P extends string> = T extends `${infer t}${U}${infer r}` ? `${t}${P}${r}` : never;

type replaced = Replace<'types are fun!', 'fun', 'awesome'> // 期望是 'types are awesome!'

[wudu8]

type MyReplace<S extends string, From extends string, To extends string> = S extends `${infer L}${From}${infer R}` ? `${L}${To}${R}` : never;

type replaced = MyReplace<'types are fun!', 'fun', 'awesome'> // 期望是 'types are awesome!'